Locking device for telescoping elements



J. SCHADE oct. -1s. 1927.

LOCKING DEVICE FOR r'I'ELESCOPING ELEMENTS Fiied Feb. 5, 1927 EIC-rml.-

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79 73y 5, IEEE=5 :E2/1517.

Patented Oct. 18, 1927.

UNITED STATES 1,645,934 PATENT OFFICE."

JOHNHSCHAIDE, OF IIOLYOKE, MASSACHUSETTS, ASSIGNOR T NATIONAL BLANK BOOK`COMPANY, OF I-IOLYOKE,*MASSACHUSETTS A VOLUNTARY TRUST ASSOCIATION OFCOPARTNEESI-IIP HAVING AS VTRUSIEES F. B. IOWNE, E. S. TOWNE, J'. M.TOWNE,

AND F. W. WILSON.

LOCKING DEVICE FOR TELESCOPING ELEMENTS.

`Application filed February 3, 1927. Serial No. 165,548.

This invention relates to locking means for fiat telescoping elements.and has for its object to simplify and improve upon the Constructionshown and described in my Letters Patent No. 1,542,841,`"issued lune 23,

Another object of the invention isto provide very simple and effectivemeans of this description, not likely to get ont of order and readilyapplied for use. y

Further objects of the invention will appear from the yaccompanyingdescription supplemented by the drawings in' which latter Figurel is a.plan View showing the inventionapplied to kan ordinary loose leafledgerf q Figure 2 isa section at the line Z-) of Figure 1'with the4sections locked- Figure 3 is a section at the line 3 3 of Figure 2-Figure 4 isa view similar to Figure-Q showing the sect-ions unlocked-Figure 5 is a section at the line 5-5 of '25 Figure 4r- Figures 6 and 7are sections at the line (3i-6 of Figure 3, with the sectionsrespectively lockedand unlockedv 1 FiguresS and 9 are brokenfviews,similar to Figures 4 and 2, but showing modifications of the inventionwith the sections respectively unlocked and locked, and

Figure 10 is a detail broken sectional elevation on an enlarged scalesimilar to Figure 4; and showing the manner of supporting the spring.

Similar numerals of reference denote like parts in the several figuresof the drawing.

While the invention is shown as applied to a loose leaf ledger, it is,of course, applicable to flat telescoping parts such as are used invarious arts.

The parts of the loose leaf ledger will be briefly referred to withoutany detail description thereof since such parts lare well known.

1, 2, are the usual metallic Cheek pieces of the ledger, and to thesecheek pieces are `respectively secured throughout their length theplates 8, 4, having the usual rectangularly disposed bottom portions 5,6, which overlap each other in sliding relation.

The outer extremities of these bottom portions 5, 6, are bent upwardlyat right angles so as to provide ends 7, 8, and terminate'at their upperedges in inwardly extending lla-Tiges 9, 10, the latter underlying theformer in telesooping relation, and these flanges are normally spacedapart for the purpose hereinafter to be explained.

rlhe parts which have just been described yform a part of theConstruction of an 0rljfvoted at 11 to the end 8 ofthe inner ftelescoping element is a locking dog 12, and pivoted respectively to a.stud 13 carried by the lower outer end of said dog, and to a stud 14carried by the end 8, arcguide blocks 15, 16, from which `ext-endrespectively teats 17, 18, and these teats extend within the ends of acoil spring 19 whereby `the latter is held against accidentaldisplacement and: is properly guided during the swinging movements ofthe locking dog, as

will be readily understood from Figure 10.

In the Vsimplest and therefore the preferred-form of the invention, asillustrated in the several figures of' the drawing, except vFigures 8and 9, the pivotal point .13 on the dog will be carried above thepivotal point 11 of the dog itself, when the dog is swung to unlocking.position, and therefore the spring will function to preserve thisunlocking position of the dog, asillustrated particularly at Figure Il,but when the dog is swung to locking position this point 13 will becarried below the point 11 and the spring i will then function to urgethisy dog into locking position, thereby increasing its bite in themanner presently to be explained.

Thus it will be seen that, in the preferred construction, the springperforms a double function. y

The dog extends upwardly vthrough an opening 2O formed by cutting awaytheV flange 10, and terminates in any suitable operating` linger piece21 which extends above the flanges.

The outer edge of the .dog is eut away to Y form a gate 22 into whichthe flange 9 of the outer telescoping member normally eX- tends, asshown at Figures 3 and 5, and when the dog is swung to unlockingposition this iiange will be spaced from the walls of the gate 22 asshown at Figures 5 and 7, but when the dog is swung in the reversedirection to locking position these gate walls will come in Contact withthis flange both at its upper and lower edges, the cornei portions ofthese walls biting said edges, as shown at Figures 3 and 6, but thisbiting will be accentuated by the action of the spring 19 which willthen be positioned as shown at Figure 2, and any attempt to separatetheseA telescoping sections will only tend to increase the bite of thedog against this flange 9.

Since the dog is pivoted to the end 8 of the inner telescoping sectionthe latter will be slightly raised when the walls of the gate 22 contactthe fiange 9, as is shown particularly in comparing the position ofparts shown respectively at Figures 2 and l, but the flange l() willnever contact the iiange 9, and the inner teles'coping sections, when-the parts are locked as above described, will be substantially in afloating condition within the outer telescoping element.

It is not necessary that this spring i9 should perform the doublefunction above set forth, and therefore, referring particularly toFigures 8 and 9, studs 23 and 24 are so located respectively on` the dogl2 and end Sthat the spring will only act to emphasize the lockingposition of the dog, and a plate spring 25, secured to a stud 26 carriedby the plate 8, has leaves 27, 28, which bear respectively against theunder side of the flange 10and against the flat seat 29 located on thedog 12, in order to hold the dog in unlocked position, as is shown atFigure 8.

When operating the dog to locking position this spring 25 will be forcedupwardly, and as soon as the stud 23 has passed below the pivotal pointl1 the coil spring will by its reactionforce the lower end of the locking dog downwardly so as to increase the bite of the walls of the gate22 against the flange 9.

lVhile a coil spring has been shown and described for assisting thepivoted dog in functioning, it will be clear that any suitable form ofspring element may be employed, the adaptation in the particularconnection above described being a mattei' of mere mechanical skill.

What is claimed is y l. The hereindescribed means for locking togetherflat telescoping elements, comprising a locking member pivoted to t-heinner of said elements and having a gate Within which the outer elementextends and capable of being swung into locking engagement with thelatter and also into unlocking position free of said out-er element, andspring means for maintaining both positions of said member.

2. A locking means for fiat elements that are normally spaced apart andtelescope one within the other, comprising al dog pivoted to the innerof said elements and having a laterally extending gate within which' theouter element is housed, the walls of said gate at their corners bitingthe opposite faces of said outer element when the dog-'is swung tolocking position, and'spring means for maintaining said lockingposition.

3. A construction as in claim 2 further distinguished in that thecorners of the gate bite the opposite faces of the outer element instaggered relation, and the 'telescoping elements are spaced apart whenlocked.

In testimony whereof I aliix my signature hereto.

JOHN SCHADE.

